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參數(shù)資料
| 型號： | TC811CKW |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | 3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs |
| 中文描述： | 3-1/2數(shù)字模擬到數(shù)字轉(zhuǎn)換器與保持和差分基準(zhǔn)輸入 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | TC811CKW |
3-145
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
3-1/2 DIGIT A/D CONVERTER WITH HOLD AND
DIFFERENTIAL REFERENCE INPUTS
TC811
Figure 6b.
Figure 7. Common-Mode Voltage Removed in Battery Operation With V
–
IN
= Analog Common
inputs permit ratiometric measurements and simplify inter-
facing with sensors such as load cells and temperature
sensors. The TC811 is ideally suited to applications in hand-
held multimeters, panel meters, and portable instrumenta-
tion. The reference voltage can be generated anywhere
within the V
+
to V
–
power supply range.
To prevent rollover type errors from being induced by
large common-mode voltages, C
REF
should be large com-
pared to stray node capacitance. A 0.1
μ
F capacitor is a
typical value.
The TC811 offers a significantly improved Analog Com-
mon temperature coefficient. This provides a very stable
voltage suitable for use as a voltage reference. The tem-
perature coefficient of Analog Common is typically
35ppm/
°
C.
DEVICE PIN FUNCTIONAL DESCRIPTION
Differential Signal Inputs (V
IN+
(Pin 31),
V
IN–
(Pin 30))
The TC811 is designed with true differential inputs and
accepts input signals within the input stage common mode
voltage range (V
CM
). The typical range is V
+
– 1.0 to V
–
+
1.5V. Common-mode voltages are removed from the sys-
tem when the TC811 operates from a battery or floating
power source (isolated from measured system) and V
IN–
is
connected to Analog Common. (see Figure 8)
In systems where common-mode voltages exist, the
86dB common-mode rejection ratio minimizes error. Com-
mon-mode voltages do, however, affect the integrator out-
put level. A worse case condition exists if a large positive
V
CM
exists in conjunction with a full-scale negative differen-
tial signal. The negative signal drives the integrator output
positive along with V
CM
(Figure 8). For such applications the
integrator output swing can be reduced below the recom-
mended 2.0V full-scale swing. The integrator output will
swing within 0.3V of V
+
or V
–
without increased linearity
error.
Reference (V
+
REF
(Pin 36), V
–
REF
(Pin 33)
Unlike the ICL7116, the TC811 has a differential refer-
ence as well as the “hold” function. The differential reference
Oscillator
Freq. (kHz)
Full-Scale Voltage (V
FS
)
200mV
RINT
CINT
2.0V
RINT
CINT
32.768
40
180k
150k
0.068
μ
F
0.068
μ
F
1.8M
1.5M
0.068
μ
F
0.068
μ
F
VBUF
V+
CAZ
VINT
BP
POL
SEGMENT
DRIVE
OSC1
OSC2
V+
V+
VR–
ANALOG
COMMON
V–
V+
V–
V+
GND
GND
MEASURED
SYSTEM
POWER
SOURCE
9V
LCD DISPLAY
TC811
+
V–
470k
V+
20M
V+
20 pF
10pF
40kHZ
Figure 8. Common-Mode Voltage Reduces Available
Integrator Swing. (V
COM
≠
V
IN
)
R
I
+
–
V
IN
V
C
I
INTEGRATOR
V
I
=
[
[
V
CM
V
IN
–
INPUT
BUFFER
C
I
=
R
I
=
INTEGRATION CAPACITOR
INTEGRATION RESISTOR
4000
f
OSC
INTEGRATION TIME
T
I
=
=
Where:
V
I
CM
–
+
–
+
TI
RI CI
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